Integrate : ∫ex.cos(ex) dx – InterviewSolution

1.

Integrate : ∫ex.cos(ex) dx

Answer»

Let e^x = z

∴ e^x.dx = dz

∴ I = ∫e^x.cos(e^x) dx = ∫cos z.dz = sin z + k = sin e^x + k

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